Cellulose-ester composition



Patented Feb. 1927.

UNIT D" TAT S} rams? JOSEPH a nnvrnson', or YONKERS, NEWYQRK, .AssrGNoB; To" CARBIDE AND CARBON we CHEMICALS, coRr'oItarIom-A CORPORATION or NEW YORK.

cELLULos E ns'rEn oomnosrrioii.

No Drawing,

' cellulose ester compositions and in particuused for many years in t 1e manufacture of for this process-is as follows: r 2O lar to an'improved plasticizer f0r cellulosev ester type compositions-of the type known as-celluloid or pyralin. glamphor has been plastics containing quantities of cellulose esters but the characteristic odor of cam--.

' phor: and its relatively vhighcost make desirable the use of'asubstitute for at least a part of thecamphor. .An Object of my nitrocellulose, a solvent and bibenzyl.

invention is ;the provision of such a substitute for campho'r. Other objects of my invention will be evident from the folloW-' "ing specification.

Pyroxyhnplasticsare generally formed by treating nitrocellulosev with camp hor and a suitable solvent: A typical formula 100 parts nitrocellulose.

l0 to parts xmedi um boiler. 10 to parts camphor.

Sufiicient acetone to make up a'mix of desired plasticity;

The medium boiler? referred to above positions well known to those skilled in the art. i

I have 'found that bibenz-ylinay be at;

stituted in whole or a part for the camphor of the above formula. solid, melting at 51.8 C. and boiling at 248 C. and has the formula:

' C H CI-I CH C H 7 While it is not a very strong solvent for nitrocellulose by itself, when mixed with alcohol it becomes a good solvent. When mixed with solution of nitrocellulose in acetone or other solvents it does not precipitate the cellulose ester out of the solution. I have found that by substituting bibenzyl for camphor, in whole or in part, in the above or other well known formulas for pyroxylin plastics a product is formed which is in no way inferior to that produced when using camphor and which is Bibenzyl is a White zer containing a substantial -Application-fi1ed May 10, 19 2s. Serial No. 108, 17 1.

superior .in freedom'from odor and other res'pects and'which can be produced at a lower cost. Y

1. A pyroxylin. plastic containing bibenzyl as a plasticizeizl 2. A'composition of matter containing 3. A composition of matter containing a solvent and l'Oto 30 parts of a plasticizer including a substantial amount of bibenz'yl. (LIA. composition of matter containing nitrocellulose, esters of the higher alcohols,

a-plasticizer including a substantial amount of bibenzyl',anda'diluent.

5.'A' composition of matter containing 10 0. parts of nitrocellulose, from 10 to 20 parts medium boiler, from 10 to 30 parts of a plastioi'zer including a substantial proportion. of bibenzyl, and acetone. V

- 6; -A composition of matter including 100 parts ofnitrocellulose, from 10 to 20 parts of esters of thelhigher alcohols, from 10 to 30 parts of .bibenz'yl and suflicient acetone to give the'desired plasticity.-

The method of making pyroxylin plastics which includes the step of treating nitrocellulose with a solvent and a plasticiproportion of bibenzyl.

8'. The method of making pyroxylin plastics which includes the steps of treating nitrocellulose with a solvent and a plasticizer containing a substantial proportion of bibenzyl and thinning the product to the desired consistency.

-9 The method claimed in claim 8 in which the solvent is an ester of the higher I JOSEPH o. DAVIDSON. 

